Air pump

ABSTRACT

An air pump has a main frame, at least one pressure cylinder, a footboard, a torsion spring, a holding device, an outlet device, and an inflating tube. The main frame has a first connecting shaft, a pivot shaft, and a second connecting shaft. The at least one pressure cylinder is mounted in the main frame, and each one of the at least one pressure cylinder has a cylinder and a cylinder axis. The footboard is connected to the pivot shaft. The torsion spring is mounted around the pivot shaft and is pressed against the footboard and the first connecting shaft. The holding device is connected to the main frame and the at least one pressure cylinder, and has multiple first holding elements. The outlet device is mounted in the main frame and is connected to the at least one pressure cylinder. The inflating tube is connected to the outlet tube and is held with the holding device.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an air pump, and more particularly relates to an air pump having a tube holding device. The air pump can be used to hold an inflating tube of the air pump with the air pump conveniently and securely.

2. Description of Related Art

A conventional air pump has a main frame, at least one pressure cylinder, a footboard, an outlet device, a pressure gauge, an inflating tube, and a gas nozzle. The at least one pressure cylinder is mounted on the main frame and each one of the at least one pressure cylinder has a cylinder and a cylinder axis. The footboard is pivotally connected to the main frame and is securely connected to the cylinder of the at least one pressure cylinder. The outlet device is connected to and communicates with the at least one pressure cylinder and has an outlet tube. The pressure gauge is mounted on the outlet device. The inflating tube is mounted around the outlet tube of the outlet device and is connected to the gas nozzle.

When a user wants to put the conventional air pump in storage, the inflating tube is wound around the main frame and the footboard. However, the wound inflating tube is not tightly fixed on the main frame and the footboard and the winding may go loose, and hence the inflating tube cannot be held securely with the main frame. This is inconvenient both in use and in storage.

The invention provides an air pump to mitigate or obviate the aforementioned problems.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide an air pump having a tube holding device, such that the air pump can be used to hold an inflating tube of the air pump with the air pump conveniently and securely.

The air pump in accordance with the present invention has a main frame, at least one pressure cylinder, a footboard, a torsion spring, a holding device, an outlet device, and an inflating tube. The main frame has a first connecting shaft, a pivot shaft, and a second connecting shaft. The at least one pressure cylinder is mounted in the main frame, and each has a cylinder and a cylinder axis. The footboard is connected to the pivot shaft. The torsion spring is mounted around the pivot shaft and is pressed against the footboard and the first connecting shaft. The holding device is connected to the main frame and the at least one pressure cylinder and has multiple first holding elements. The outlet device is mounted in the main frame and is connected to the at least one pressure cylinder. The inflating tube is connected to the outlet tube and is held with the holding device.

Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an air pump in accordance with the present invention;

FIG. 2 is another perspective view of the air pump in FIG. 1;

FIG. 3 is a partially exploded perspective view of the air pump in FIG. 2;

FIG. 4 is a bottom view of the air pump in FIG. 1;

FIG. 5 is an enlarged cross sectional side view of the air pump in FIG. 1; and

FIG. 6 is an operational bottom view of the air pump in FIG. 1.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

With reference to FIGS. 1, 2 and 6, an air pump in accordance with the present invention comprises a main frame 10, at least one pressure cylinder 20, a footboard 30, at least one torsion spring 40, a holding device 50, an outlet device 70, and an inflating tube 80.

The main frame 10 has a front end, a rear end, a first connecting shaft 11, a pivot shaft 12 and a second connecting shaft 13. The pivot shaft 12 is transversally connected to the front end of the main frame 10. The first connecting shaft 11 is transversally connected to the main frame 10 proximal to the front end of the main frame 10 and is parallel with the pivot shaft 12. The second connecting shaft 13 is transversally connected to the main frame 10 proximal to the rear end of the main frame 10.

The at least one pressure cylinder 20 is mounted in the main frame 10, and each one of the at least one pressure cylinder 20 has a cylinder 21 and a cylinder axis 22. The cylinder 21 is movably mounted in the main frame 10. The cylinder axis 22 is connected to the cylinder 21, is connected securely to the second connecting shaft 13, and has an inner end and an outer end. The inner end of the cylinder axis 22 is mounted in the cylinder 21. The outer end of the cylinder axis 22 is securely connected to the second connecting shaft 13 of the main frame 10. Preferably, the air pump has two pressure cylinders 20 mounted in the main frame 10 at an interval.

The footboard 30 is connected to the pivot shaft 12 of the main frame 10 to enable the footboard 30 to rotate relative to the main frame 10, is securely connected to the cylinder 21 of the at least one pressure cylinder 20, and has a positioning shaft 31. The positioning shaft 31 is rotatably connected to the main frame 10 proximal to the second connecting shaft 13 and selectively engages with the footboard 30.

The at least one torsion spring 40 is mounted around the pivot shaft 12 of the main frame 10, and each one of the at least one torsion spring 40 has two ends. The ends of each one of the at least one torsion spring 40 are each respectively pressed against the footboard 30 and the first connecting shaft 11 of the main frame 10.

The holding device 50 is connected to the main frame 10 and the at least one pressure cylinder 20, and has multiple first holding elements 51 and at least one second holding element 60.

With reference to FIGS. 3 and 4, each first holding element 51 has a first body 52 and an auxiliary arm 55. The first body 52 is securely mounted on the first connecting shaft 11 and has a top, a bottom, a front side, a first assembling recess 54 and a first holding recess 53. The first assembling recess 54 is formed in the top of the first body 52 such that the first body 52 is mounted around the first connecting shaft 11 via the first assembling recess 54. The first holding recess 53 is formed in the bottom of the first body 52. The auxiliary arm 55 is formed on and protrudes from the front side of the first body 52 and has a free end and a locating recess 56. The free end of the auxiliary arm 55 extends below the pivot shaft 12 between the main frame 10 and the footboard 30, and has a top surface. The locating recess 56 is formed in the top surface of the free end of the auxiliary arm 55 such that the auxiliary arm 55 is mounted around the pivot shaft 12 via the locating recess 56 to prevent the first holding element 51 from rotating relative to the main frame 10.

With further reference to FIGS. 3, 5 and 6, each one of the at least one second holding element 60 is mounted around the second connecting shaft 13 of the main frame 10, is connected to the at least one pressure cylinder 20, and has a second body 61. The second body 61 may be S-shaped and has a top, a bottom, a front side, a rear side, a second holding recess 62, a second assembling recess 63, and a connecting hole 64. The second holding recess 62 is formed in the rear side of the second body 61 proximal to the bottom of the second body 61. The second assembling recess 63 is formed in the front side of the second body 61 proximal to the top of the second body 61 above the second holding recess 62, and is mounted around the second connecting shaft 13 of the main frame 10. The connecting hole 64 is formed through the rear side of the second body 61, communicates with the second assembling recess 63, and is mounted around the cylinder axis 22 of the at least one pressure cylinder 20.

With reference to FIGS. 2, 5 and 6, the outlet device 70 is mounted in the main frame 10, is connected to the at least one pressure cylinder 20, and communicates with the cylinder 21 of the at least one pressure cylinder 20. The outlet device 70 has an outlet tube 71 extending over the first connecting shaft 11. The inflating tube 80 is connected to the outlet tube 71, is mounted in the main frame 10, and is held with the holding device 50. The inflating tube 80 has a connecting end and an inlet end. The connecting end of the inflating tube 80 is mounted around the outlet tube 71 of the outlet device 70, and communicates with the cylinder 21 of the at least one pressure cylinder 20 via the outlet device 70. The inlet end of the inflating tube 80 extends across the pivot shaft 12 and extends through and positioned by the holding recesses 53, 62 of the holding elements 51, 60 to enable the inflating tube 80 to be held in the main frame 10 in an annular configuration by the holding device 50. In addition, when the inflating tube 80 is held by the at least one second holding element 60, the inflating tube 80 is located between the second connecting shaft 13 of the main frame 10 and the positioning shaft 31 of the footboard 30.

According to the above-mentioned features, the air pump in accordance with the present invention can be used to hold the inflating tube 80 with the main frame 10 in an annular configuration securely and conveniently by mounting the inflating tube in the holding recesses 53, 62 of the holding elements 51, 60 of the holding device 50.

Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. 

What is claimed is:
 1. An air pump comprising: a main frame having: a front end; a rear end; a pivot shaft transversally connected to the front end of the main frame; a first connecting shaft transversally connected to the main frame proximal to the front end of the main frame and being parallel with the pivot shaft; and a second connecting shaft transversally connected to the main frame proximal to the rear end of the main frame; at least one pressure cylinder mounted in the main frame, and each one of the at least one pressure cylinder having a cylinder movably mounted in the main frame; and a cylinder axis connected to the cylinder, connected securely to the second connecting shaft, and having an inner end mounted in the cylinder; and an outer end securely connected to the second connecting shaft of the main frame; a footboard connected to the pivot shaft of the main frame to enable the footboard to rotate relative to the main frame and to be securely connected to the cylinder of the at least one pressure cylinder; at least one torsion spring mounted around the pivot shaft of the main frame, and each one of the at least one torsion spring having two ends each respectively pressed against the footboard and the first connecting shaft of the main frame; a holding device connected to the main frame and having multiple first holding elements, and each first holding element having a first body securely mounted on the first connecting shaft and having a top; a bottom; a front side; and a first holding recess formed in the bottom of the first body; an outlet device mounted in the main frame, connected to the at least one pressure cylinder, and communicating with the cylinder of the at least one pressure cylinder, and the outlet device having an outlet tube extending over the first connecting shaft; and an inflating tube connected to the outlet tube, mounted in the main frame, and held with the holding device, and the inflating tube having a connecting end mounted around the outlet tube of the outlet device and communicating with the cylinder of the at least one pressure cylinder via the outlet device; and an inlet end extending across the pivot shaft and extending through the holding recesses of the first holding elements to enable the inflating tube to be held in the main frame in an annular configuration by the holding device.
 2. The air pump as claimed in claim 1, wherein the first body of each one of the first holding elements has a first assembling recess formed in the top of the first body and mounted around the first connecting shaft.
 3. The air pump as claimed in claim 2, wherein each first holding element has an auxiliary arm formed on and protruding from the front side of the first body of the corresponding first holding element, and the auxiliary arm having: a free end extending below the pivot shaft between the main frame and the footboard, and having a top surface; and a locating recess formed in the top surface of the free end of the auxiliary arm and mounted around the pivot shaft to prevent the first holding element from rotating relative to the main frame.
 4. The air pump as claimed in claim 1, wherein the holding device has at least one second holding element mounted around the second connecting shaft of the main frame, and each one of the at least one second holding element having: a second body being S-shaped and having a top; a bottom; a front side; a rear side; and a second holding recess formed in the rear side of the second body proximal to the bottom of the second body to hold the inflating tube with the main frame.
 5. The air pump as claimed in claim 2, wherein the holding device has at least one second holding element mounted around the second connecting shaft of the main frame, and each one of the at least one second holding element having: a second body being S-shaped and having a top; a bottom; a front side; a rear side; and a second holding recess formed in the rear side of the second body proximal to the bottom of the second body to hold the inflating tube with the main frame.
 6. The air pump as claimed in claim 3, wherein the holding device has at least one second holding element mounted around the second connecting shaft of the main frame, and each one of the at least one second holding element having: a second body being S-shaped and having a top; a bottom; a front side; a rear side; and a second holding recess formed in the rear side of the second body proximal to the bottom of the second body to hold the inflating tube with the main frame.
 7. The air pump as claimed in claim 4, wherein the second body of each one of the at least one second holding element has a second assembling recess formed in the front side of the second body proximal to the top of the second body above the second holding recess, and mounted around the second connecting shaft of the main frame; and a connecting hole formed through the rear side of the second body, communicating with the second assembling hole, and mounted around the cylinder axis of the at least one pressure cylinder.
 8. The air pump as claimed in claim 5, wherein the second body of each one of the at least one second holding element has a second assembling recess formed in the front side of the second body to the top of the second body above the second holding recess, and mounted around the second connecting shaft of the main frame; and a connecting hole formed through the rear side of the second body, communicating with the second assembling hole, and mounted around the cylinder axis of the at least one pressure cylinder.
 9. The air pump as claimed in claim 6, wherein the second body of each one of the at least one second holding element has a second assembling recess formed in the front side of the second body proximal to the top of the second body above the second holding recess, and mounted around the second connecting shaft of the main frame; and a connecting hole formed through the rear side of the second body, communicating with the second assembling hole, and mounted around the cylinder axis of the at least one pressure cylinder. 